Delaware is famous for having no sales tax, which makes buying a car there seem tax-free. It is not quite: the state charges a 4.25 percent motor-vehicle document fee on the purchase price when you register. This calculator shows what that fee actually costs.
How it works
The document fee replaces a sales tax and is applied to the net price:
taxable amount = purchase price − eligible trade-in
document fee = 4.25% × taxable amount (minimum applies)
out the door = purchase price + document fee
Because there is no percentage sales tax stacked on top, the document fee is your main state cost on the vehicle, and a trade-in directly shrinks the amount it is calculated on.
Example and tips
A 30,000 dollar car with a 6,000 dollar trade-in has a 24,000 dollar taxable amount, so the 4.25 percent document fee is 1,020 dollars, making the price with fee about 31,020 dollars. To minimize the fee, trade your old car in to the same Delaware dealer rather than selling it privately, since the trade-in allowance reduces the value the document fee is calculated on.